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• How to check result mp4's integrity ?

  10 mai 2017, par Al.T.Os

  There are 4 categories, each Categories has 10 mp4 files.

  I used ffmpeg to concatenate 4 categories, such as cat1 | cat2 | cat3 | cat4.

  With simple calculation, I get 10000 concatenated mp4 files.

  Here is the problem. There are some mp4 files among the 10000 files that are wrongly encoded. So I can’t play the files. I found 100 files so far.

  Is there any options that I can check the concatenated mp4 is correctly encoded ? Or can I verify all of them without playing ?

  I’ve searched Stack Overflow and seen ffmpeg’s options but I’m not used to ffmpeg and it looks it’d take super long but I got no much time.

• avformat/flacdec : Check avio_read result when reading flac block header.

  24 janvier 2017, par Frank Liberato

  avformat/flacdec : Check avio_read result when reading flac block header.
  Return AVERROR_INVALIDDATA if all four bytes aren’t present.
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libavformat/flacdec.c

• Can you put the result of a blackdetect filter in a textfile using ffmpeg ?

  9 mars 2017, par Gijserman

  I’m testing out the "blackdetect" filter in ffmpeg. I want to have the times when the video is black to be read by a script (like actionscript or javascript). I tried :

  ffmpeg -i video1.mp4 -vf "blackdetect=d=2:pix_th=0.00" -an -f null -

  And I get a nice result in the ffmpeg log :

  ffmpeg version N-55644-g68b63a3 Copyright (c) 2000-2013 the FFmpeg developers
  
    built on Aug 19 2013 20:32:00 with gcc 4.7.3 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetyp
  
  e --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --ena
  
  ble-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-l
  
  ibopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libsp
  
  eex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-
  
  amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --
  
  enable-libxvid --enable-zlib
  
    libavutil      52. 42.100 / 52. 42.100
  
    libavcodec     55. 28.100 / 55. 28.100
  
    libavformat    55. 13.103 / 55. 13.103
  
    libavdevice    55.  3.100 / 55.  3.100
  
    libavfilter     3. 82.100 /  3. 82.100
  
    libswscale      2.  5.100 /  2.  5.100
  
    libswresample   0. 17.103 /  0. 17.103
  
    libpostproc    52.  3.100 / 52.  3.100
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'video1.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      creation_time   : 1970-01-01 00:00:00
  
      encoder         : Lavf53.13.0
  
    Duration: 00:02:01.54, start: 0.000000, bitrate: 275 kb/s
  
      Stream #0:0(eng): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 768x432 [
  
  SAR 1:1 DAR 16:9], 211 kb/s, 25 fps, 25 tbr, 25 tbn, 50 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : VideoHandler
  
      Stream #0:1(eng): Audio: aac (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 59
  
   kb/s
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : SoundHandler
  
  Output #0, null, to 'pipe:':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf55.13.103
  
      Stream #0:0(eng): Video: rawvideo (I420 / 0x30323449), yuv420p, 768x432 [SAR
  
   1:1 DAR 16:9], q=2-31, 200 kb/s, 90k tbn, 25 tbc
  
      Metadata:
  
        creation_time   : 1970-01-01 00:00:00
  
        handler_name    : VideoHandler
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 -> rawvideo)
  
  Press [q] to stop, [?] for help
  
  [null @ 00000000003279a0] Encoder did not produce proper pts, making some up.
  
  [blackdetect @ 0000000004d5e800] black_start:0 black_end:17.08 black_duration:17
  
  .08
  
  [blackdetect @ 0000000004d5e800] black_start:62.32 black_end:121.48 black_durati
  
  on:59.16
  
  frame= 3038 fps=2317 q=0.0 Lsize=N/A time=00:02:01.52 bitrate=N/A
  
  video:285kB audio:0kB subtitle:0 global headers:0kB muxing overhead -100.007543%

  And I’m particularly interested in this part :

  [blackdetect @ 0000000004e2e340] black_start:0 black_end:17.08 black_duration:17.08
  
  [blackdetect @ 0000000004e2e340] black_start:62.32 black_end:121.48 black_duration:59.16

  So my question :

  1. Is there a way to only take the blackdetect filter output and put it in a .txt file ?
  2. And if this is possible, is there a way to do this in a statement with multiple video inputs ? Like in this example

  ---

  example :

  ffmpeg -f concat -i mylist.txt -c copy concat.mp4

  Where mylist.txt is a list of videos :

  file 'video1.mp4'
  
  file 'video2.mp4'
  
  file 'video3.mp4'
  
  file 'video4.mp4'

  ---

  Basically what I want to have is one or more text files containing information about the black frames in every video in this list to be used by another program